Spiral sand washing machines are divided into two types: single spiral sand washing machines and double spiral sand washing machines. They are mainly used for washing, grading, and impurity removal in industries such as highways, hydropower, and construction, as well as for washing and selecting fine-grained and coarse-grained materials. It has low power consumption and high cleanliness. The excellent sealing structure, fully enclosed transmission device, and adjustable weir plate ensure the durability of the equipment, good cleaning and dehydration effects, and stable fine-grained products.